Subject: Re: [stella] entropy & randomness From: "R. Thavas" <urchlay@xxxxxxxxxxxxx> Date: Wed, 10 Oct 2001 18:25:41 -0400 (EDT) |
On Wed, 10 Oct 2001, Chris Wilkson wrote: > On Wed, 10 Oct 2001 urchlay@xxxxxxxxxxxxxxxx wrote: > > > Is there anything actually random in Pitfall? The game seems the same > > every time... Pitfall II had what, some sorta hardware random number > > generator? I've got the disassembly of River Raid that was posted here, > > will look when I get home. > > Exactly!!! The whole point of those LFSRs is that they are only quasi-random. > The Pitfall LFSR is sequential not only forwards, but backwards as well. > This enabled David Crane to fit a *huge* map (255 rooms, IIRC) that is always > the same, into just a few bytes. It's such a beautiful thing. > > -Chris > When I was a kid, I always thought pitfall would have been more challenging if the map really had been random, different each time you play. I suppose it would have been impossible to compare your score to your friend's, but otherwise it would have been great. B. - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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